We demonstrate the coherent control of ultrafast shift currents in GaAs with two orthogonally polarized linearly chirped laser pulses. By varying the chirp and phase delay between the pulses, we achieve the control of the shape of the shift current transients in a wide range from a monopolar shape to different bipolar shapes (alternating currents). Moreover, the terahertz emission patterns resulting from the ultrafast shift currents allow one to determine the sign of the chirp of the laser pulses.
© 2009 Optical Society of America
Original Manuscript: June 11, 2009
Manuscript Accepted: July 6, 2009
Published: September 9, 2009
Ana Maria Racu, Shekhar Priyadarshi, Markus Leidinger, Uwe Siegner, and Mark Bieler, "Coherent control of ultrafast shift currents in GaAs with chirped optical pulses," Opt. Lett. 34, 2784-2786 (2009)